1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2008-2010, 2015 Robert N. M. Watson 5 * Copyright (c) 2012 FreeBSD Foundation 6 * All rights reserved. 7 * 8 * This software was developed at the University of Cambridge Computer 9 * Laboratory with support from a grant from Google, Inc. 10 * 11 * Portions of this software were developed by Pawel Jakub Dawidek under 12 * sponsorship from the FreeBSD Foundation. 13 * 14 * Redistribution and use in source and binary forms, with or without 15 * modification, are permitted provided that the following conditions 16 * are met: 17 * 1. Redistributions of source code must retain the above copyright 18 * notice, this list of conditions and the following disclaimer. 19 * 2. Redistributions in binary form must reproduce the above copyright 20 * notice, this list of conditions and the following disclaimer in the 21 * documentation and/or other materials provided with the distribution. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 /* 37 * Definitions for FreeBSD capabilities facility. 38 */ 39 #ifndef _SYS_CAPSICUM_H_ 40 #define _SYS_CAPSICUM_H_ 41 42 #include <sys/param.h> 43 44 #include <sys/caprights.h> 45 #include <sys/file.h> 46 #include <sys/fcntl.h> 47 48 #ifndef _KERNEL 49 #include <stdbool.h> 50 #endif 51 52 #define CAPRIGHT(idx, bit) ((1ULL << (57 + (idx))) | (bit)) 53 54 /* 55 * Possible rights on capabilities. 56 * 57 * Notes: 58 * Some system calls don't require a capability in order to perform an 59 * operation on an fd. These include: close, dup, dup2. 60 * 61 * sendfile is authorized using CAP_READ on the file and CAP_WRITE on the 62 * socket. 63 * 64 * mmap() and aio*() system calls will need special attention as they may 65 * involve reads or writes depending a great deal on context. 66 */ 67 68 /* INDEX 0 */ 69 70 /* 71 * General file I/O. 72 */ 73 /* Allows for openat(O_RDONLY), read(2), readv(2). */ 74 #define CAP_READ CAPRIGHT(0, 0x0000000000000001ULL) 75 /* Allows for openat(O_WRONLY | O_APPEND), write(2), writev(2). */ 76 #define CAP_WRITE CAPRIGHT(0, 0x0000000000000002ULL) 77 /* Allows for lseek(fd, 0, SEEK_CUR). */ 78 #define CAP_SEEK_TELL CAPRIGHT(0, 0x0000000000000004ULL) 79 /* Allows for lseek(2). */ 80 #define CAP_SEEK (CAP_SEEK_TELL | 0x0000000000000008ULL) 81 /* Allows for aio_read(2), pread(2), preadv(2). */ 82 #define CAP_PREAD (CAP_SEEK | CAP_READ) 83 /* 84 * Allows for aio_write(2), openat(O_WRONLY) (without O_APPEND), pwrite(2), 85 * pwritev(2). 86 */ 87 #define CAP_PWRITE (CAP_SEEK | CAP_WRITE) 88 /* Allows for mmap(PROT_NONE). */ 89 #define CAP_MMAP CAPRIGHT(0, 0x0000000000000010ULL) 90 /* Allows for mmap(PROT_READ). */ 91 #define CAP_MMAP_R (CAP_MMAP | CAP_SEEK | CAP_READ) 92 /* Allows for mmap(PROT_WRITE). */ 93 #define CAP_MMAP_W (CAP_MMAP | CAP_SEEK | CAP_WRITE) 94 /* Allows for mmap(PROT_EXEC). */ 95 #define CAP_MMAP_X (CAP_MMAP | CAP_SEEK | 0x0000000000000020ULL) 96 /* Allows for mmap(PROT_READ | PROT_WRITE). */ 97 #define CAP_MMAP_RW (CAP_MMAP_R | CAP_MMAP_W) 98 /* Allows for mmap(PROT_READ | PROT_EXEC). */ 99 #define CAP_MMAP_RX (CAP_MMAP_R | CAP_MMAP_X) 100 /* Allows for mmap(PROT_WRITE | PROT_EXEC). */ 101 #define CAP_MMAP_WX (CAP_MMAP_W | CAP_MMAP_X) 102 /* Allows for mmap(PROT_READ | PROT_WRITE | PROT_EXEC). */ 103 #define CAP_MMAP_RWX (CAP_MMAP_R | CAP_MMAP_W | CAP_MMAP_X) 104 /* Allows for openat(O_CREAT). */ 105 #define CAP_CREATE CAPRIGHT(0, 0x0000000000000040ULL) 106 /* Allows for openat(O_EXEC) and fexecve(2) in turn. */ 107 #define CAP_FEXECVE CAPRIGHT(0, 0x0000000000000080ULL) 108 /* Allows for openat(O_SYNC), openat(O_FSYNC), fsync(2), aio_fsync(2). */ 109 #define CAP_FSYNC CAPRIGHT(0, 0x0000000000000100ULL) 110 /* Allows for openat(O_TRUNC), ftruncate(2). */ 111 #define CAP_FTRUNCATE CAPRIGHT(0, 0x0000000000000200ULL) 112 113 /* Lookups - used to constrain *at() calls. */ 114 #define CAP_LOOKUP CAPRIGHT(0, 0x0000000000000400ULL) 115 116 /* VFS methods. */ 117 /* Allows for fchdir(2). */ 118 #define CAP_FCHDIR CAPRIGHT(0, 0x0000000000000800ULL) 119 /* Allows for fchflags(2). */ 120 #define CAP_FCHFLAGS CAPRIGHT(0, 0x0000000000001000ULL) 121 /* Allows for fchflags(2) and chflagsat(2). */ 122 #define CAP_CHFLAGSAT (CAP_FCHFLAGS | CAP_LOOKUP) 123 /* Allows for fchmod(2). */ 124 #define CAP_FCHMOD CAPRIGHT(0, 0x0000000000002000ULL) 125 /* Allows for fchmod(2) and fchmodat(2). */ 126 #define CAP_FCHMODAT (CAP_FCHMOD | CAP_LOOKUP) 127 /* Allows for fchown(2). */ 128 #define CAP_FCHOWN CAPRIGHT(0, 0x0000000000004000ULL) 129 /* Allows for fchown(2) and fchownat(2). */ 130 #define CAP_FCHOWNAT (CAP_FCHOWN | CAP_LOOKUP) 131 /* Allows for fcntl(2). */ 132 #define CAP_FCNTL CAPRIGHT(0, 0x0000000000008000ULL) 133 /* 134 * Allows for flock(2), openat(O_SHLOCK), openat(O_EXLOCK), 135 * fcntl(F_SETLK_REMOTE), fcntl(F_SETLKW), fcntl(F_SETLK), fcntl(F_GETLK). 136 */ 137 #define CAP_FLOCK CAPRIGHT(0, 0x0000000000010000ULL) 138 /* Allows for fpathconf(2). */ 139 #define CAP_FPATHCONF CAPRIGHT(0, 0x0000000000020000ULL) 140 /* Allows for UFS background-fsck operations. */ 141 #define CAP_FSCK CAPRIGHT(0, 0x0000000000040000ULL) 142 /* Allows for fstat(2). */ 143 #define CAP_FSTAT CAPRIGHT(0, 0x0000000000080000ULL) 144 /* Allows for fstat(2), fstatat(2) and faccessat(2). */ 145 #define CAP_FSTATAT (CAP_FSTAT | CAP_LOOKUP) 146 /* Allows for fstatfs(2). */ 147 #define CAP_FSTATFS CAPRIGHT(0, 0x0000000000100000ULL) 148 /* Allows for futimens(2) and futimes(2). */ 149 #define CAP_FUTIMES CAPRIGHT(0, 0x0000000000200000ULL) 150 /* Allows for futimens(2), futimes(2), futimesat(2) and utimensat(2). */ 151 #define CAP_FUTIMESAT (CAP_FUTIMES | CAP_LOOKUP) 152 /* Allows for linkat(2) (target directory descriptor). */ 153 #define CAP_LINKAT_TARGET (CAP_LOOKUP | 0x0000000000400000ULL) 154 /* Allows for mkdirat(2). */ 155 #define CAP_MKDIRAT (CAP_LOOKUP | 0x0000000000800000ULL) 156 /* Allows for mkfifoat(2). */ 157 #define CAP_MKFIFOAT (CAP_LOOKUP | 0x0000000001000000ULL) 158 /* Allows for mknodat(2). */ 159 #define CAP_MKNODAT (CAP_LOOKUP | 0x0000000002000000ULL) 160 /* Allows for renameat(2) (source directory descriptor). */ 161 #define CAP_RENAMEAT_SOURCE (CAP_LOOKUP | 0x0000000004000000ULL) 162 /* Allows for symlinkat(2). */ 163 #define CAP_SYMLINKAT (CAP_LOOKUP | 0x0000000008000000ULL) 164 /* 165 * Allows for unlinkat(2) and renameat(2) if destination object exists and 166 * will be removed. 167 */ 168 #define CAP_UNLINKAT (CAP_LOOKUP | 0x0000000010000000ULL) 169 170 /* Socket operations. */ 171 /* Allows for accept(2) and accept4(2). */ 172 #define CAP_ACCEPT CAPRIGHT(0, 0x0000000020000000ULL) 173 /* Allows for bind(2). */ 174 #define CAP_BIND CAPRIGHT(0, 0x0000000040000000ULL) 175 /* Allows for connect(2). */ 176 #define CAP_CONNECT CAPRIGHT(0, 0x0000000080000000ULL) 177 /* Allows for getpeername(2). */ 178 #define CAP_GETPEERNAME CAPRIGHT(0, 0x0000000100000000ULL) 179 /* Allows for getsockname(2). */ 180 #define CAP_GETSOCKNAME CAPRIGHT(0, 0x0000000200000000ULL) 181 /* Allows for getsockopt(2). */ 182 #define CAP_GETSOCKOPT CAPRIGHT(0, 0x0000000400000000ULL) 183 /* Allows for listen(2). */ 184 #define CAP_LISTEN CAPRIGHT(0, 0x0000000800000000ULL) 185 /* Allows for sctp_peeloff(2). */ 186 #define CAP_PEELOFF CAPRIGHT(0, 0x0000001000000000ULL) 187 #define CAP_RECV CAP_READ 188 #define CAP_SEND CAP_WRITE 189 /* Allows for setsockopt(2). */ 190 #define CAP_SETSOCKOPT CAPRIGHT(0, 0x0000002000000000ULL) 191 /* Allows for shutdown(2). */ 192 #define CAP_SHUTDOWN CAPRIGHT(0, 0x0000004000000000ULL) 193 194 /* Allows for bindat(2) on a directory descriptor. */ 195 #define CAP_BINDAT (CAP_LOOKUP | 0x0000008000000000ULL) 196 /* Allows for connectat(2) on a directory descriptor. */ 197 #define CAP_CONNECTAT (CAP_LOOKUP | 0x0000010000000000ULL) 198 199 /* Allows for linkat(2) (source directory descriptor). */ 200 #define CAP_LINKAT_SOURCE (CAP_LOOKUP | 0x0000020000000000ULL) 201 /* Allows for renameat(2) (target directory descriptor). */ 202 #define CAP_RENAMEAT_TARGET (CAP_LOOKUP | 0x0000040000000000ULL) 203 204 #define CAP_SOCK_CLIENT \ 205 (CAP_CONNECT | CAP_GETPEERNAME | CAP_GETSOCKNAME | CAP_GETSOCKOPT | \ 206 CAP_PEELOFF | CAP_RECV | CAP_SEND | CAP_SETSOCKOPT | CAP_SHUTDOWN) 207 #define CAP_SOCK_SERVER \ 208 (CAP_ACCEPT | CAP_BIND | CAP_GETPEERNAME | CAP_GETSOCKNAME | \ 209 CAP_GETSOCKOPT | CAP_LISTEN | CAP_PEELOFF | CAP_RECV | CAP_SEND | \ 210 CAP_SETSOCKOPT | CAP_SHUTDOWN) 211 212 /* All used bits for index 0. */ 213 #define CAP_ALL0 CAPRIGHT(0, 0x000007FFFFFFFFFFULL) 214 215 /* Available bits for index 0. */ 216 #define CAP_UNUSED0_44 CAPRIGHT(0, 0x0000080000000000ULL) 217 /* ... */ 218 #define CAP_UNUSED0_57 CAPRIGHT(0, 0x0100000000000000ULL) 219 220 /* INDEX 1 */ 221 222 /* Mandatory Access Control. */ 223 /* Allows for mac_get_fd(3). */ 224 #define CAP_MAC_GET CAPRIGHT(1, 0x0000000000000001ULL) 225 /* Allows for mac_set_fd(3). */ 226 #define CAP_MAC_SET CAPRIGHT(1, 0x0000000000000002ULL) 227 228 /* Methods on semaphores. */ 229 #define CAP_SEM_GETVALUE CAPRIGHT(1, 0x0000000000000004ULL) 230 #define CAP_SEM_POST CAPRIGHT(1, 0x0000000000000008ULL) 231 #define CAP_SEM_WAIT CAPRIGHT(1, 0x0000000000000010ULL) 232 233 /* Allows select(2) and poll(2) on descriptor. */ 234 #define CAP_EVENT CAPRIGHT(1, 0x0000000000000020ULL) 235 /* Allows for kevent(2) on kqueue descriptor with eventlist != NULL. */ 236 #define CAP_KQUEUE_EVENT CAPRIGHT(1, 0x0000000000000040ULL) 237 238 /* Strange and powerful rights that should not be given lightly. */ 239 /* Allows for ioctl(2). */ 240 #define CAP_IOCTL CAPRIGHT(1, 0x0000000000000080ULL) 241 #define CAP_TTYHOOK CAPRIGHT(1, 0x0000000000000100ULL) 242 243 /* Process management via process descriptors. */ 244 /* Allows for pdgetpid(2). */ 245 #define CAP_PDGETPID CAPRIGHT(1, 0x0000000000000200ULL) 246 /* 247 * Allows for pdwait4(2). 248 * 249 * XXX: this constant was imported unused, but is targeted to be implemented 250 * in the future (bug 235871). 251 */ 252 #define CAP_PDWAIT CAPRIGHT(1, 0x0000000000000400ULL) 253 /* Allows for pdkill(2). */ 254 #define CAP_PDKILL CAPRIGHT(1, 0x0000000000000800ULL) 255 256 /* Extended attributes. */ 257 /* Allows for extattr_delete_fd(2). */ 258 #define CAP_EXTATTR_DELETE CAPRIGHT(1, 0x0000000000001000ULL) 259 /* Allows for extattr_get_fd(2). */ 260 #define CAP_EXTATTR_GET CAPRIGHT(1, 0x0000000000002000ULL) 261 /* Allows for extattr_list_fd(2). */ 262 #define CAP_EXTATTR_LIST CAPRIGHT(1, 0x0000000000004000ULL) 263 /* Allows for extattr_set_fd(2). */ 264 #define CAP_EXTATTR_SET CAPRIGHT(1, 0x0000000000008000ULL) 265 266 /* Access Control Lists. */ 267 /* Allows for acl_valid_fd_np(3). */ 268 #define CAP_ACL_CHECK CAPRIGHT(1, 0x0000000000010000ULL) 269 /* Allows for acl_delete_fd_np(3). */ 270 #define CAP_ACL_DELETE CAPRIGHT(1, 0x0000000000020000ULL) 271 /* Allows for acl_get_fd(3) and acl_get_fd_np(3). */ 272 #define CAP_ACL_GET CAPRIGHT(1, 0x0000000000040000ULL) 273 /* Allows for acl_set_fd(3) and acl_set_fd_np(3). */ 274 #define CAP_ACL_SET CAPRIGHT(1, 0x0000000000080000ULL) 275 276 /* Allows for kevent(2) on kqueue descriptor with changelist != NULL. */ 277 #define CAP_KQUEUE_CHANGE CAPRIGHT(1, 0x0000000000100000ULL) 278 279 #define CAP_KQUEUE (CAP_KQUEUE_EVENT | CAP_KQUEUE_CHANGE) 280 281 /* All used bits for index 1. */ 282 #define CAP_ALL1 CAPRIGHT(1, 0x00000000001FFFFFULL) 283 284 /* Available bits for index 1. */ 285 #define CAP_UNUSED1_22 CAPRIGHT(1, 0x0000000000200000ULL) 286 /* ... */ 287 #define CAP_UNUSED1_57 CAPRIGHT(1, 0x0100000000000000ULL) 288 289 /* Backward compatibility. */ 290 #define CAP_POLL_EVENT CAP_EVENT 291 292 #define CAP_ALL(rights) do { \ 293 (rights)->cr_rights[0] = \ 294 ((uint64_t)CAP_RIGHTS_VERSION << 62) | CAP_ALL0; \ 295 (rights)->cr_rights[1] = CAP_ALL1; \ 296 } while (0) 297 298 #define CAP_NONE(rights) do { \ 299 (rights)->cr_rights[0] = \ 300 ((uint64_t)CAP_RIGHTS_VERSION << 62) | CAPRIGHT(0, 0ULL); \ 301 (rights)->cr_rights[1] = CAPRIGHT(1, 0ULL); \ 302 } while (0) 303 304 #define CAPRVER(right) ((int)((right) >> 62)) 305 #define CAPVER(rights) CAPRVER((rights)->cr_rights[0]) 306 #define CAPARSIZE(rights) (CAPVER(rights) + 2) 307 #define CAPIDXBIT(right) ((int)(((right) >> 57) & 0x1F)) 308 309 /* 310 * Allowed fcntl(2) commands. 311 */ 312 #define CAP_FCNTL_GETFL (1 << F_GETFL) 313 #define CAP_FCNTL_SETFL (1 << F_SETFL) 314 #define CAP_FCNTL_GETOWN (1 << F_GETOWN) 315 #define CAP_FCNTL_SETOWN (1 << F_SETOWN) 316 #define CAP_FCNTL_ALL (CAP_FCNTL_GETFL | CAP_FCNTL_SETFL | \ 317 CAP_FCNTL_GETOWN | CAP_FCNTL_SETOWN) 318 319 #define CAP_IOCTLS_ALL SSIZE_MAX 320 321 __BEGIN_DECLS 322 323 #define cap_rights_init(...) \ 324 __cap_rights_init(CAP_RIGHTS_VERSION, __VA_ARGS__, 0ULL) 325 cap_rights_t *__cap_rights_init(int version, cap_rights_t *rights, ...); 326 327 #define cap_rights_set(...) \ 328 __cap_rights_set(__VA_ARGS__, 0ULL) 329 cap_rights_t *__cap_rights_set(cap_rights_t *rights, ...); 330 331 #define cap_rights_clear(...) \ 332 __cap_rights_clear(__VA_ARGS__, 0ULL) 333 cap_rights_t *__cap_rights_clear(cap_rights_t *rights, ...); 334 335 #define cap_rights_is_set(...) \ 336 __cap_rights_is_set(__VA_ARGS__, 0ULL) 337 bool __cap_rights_is_set(const cap_rights_t *rights, ...); 338 339 bool cap_rights_is_empty(const cap_rights_t *rights); 340 341 bool cap_rights_is_valid(const cap_rights_t *rights); 342 cap_rights_t *cap_rights_merge(cap_rights_t *dst, const cap_rights_t *src); 343 cap_rights_t *cap_rights_remove(cap_rights_t *dst, const cap_rights_t *src); 344 345 #ifdef _KERNEL 346 /* 347 * We only support one size to reduce branching. 348 */ 349 _Static_assert(CAP_RIGHTS_VERSION == CAP_RIGHTS_VERSION_00, 350 "unsupported version of capsicum rights"); 351 352 #define cap_rights_init_zero(r) ({ \ 353 cap_rights_t *_r = (r); \ 354 CAP_NONE(_r); \ 355 _r; \ 356 }) 357 358 #define cap_rights_init_one(r, right) ({ \ 359 CTASSERT(CAPRVER(right) == CAP_RIGHTS_VERSION); \ 360 cap_rights_t *_r = (r); \ 361 CAP_NONE(_r); \ 362 _r->cr_rights[CAPIDXBIT(right) - 1] |= right; \ 363 _r; \ 364 }) 365 366 #define cap_rights_set_one(r, right) ({ \ 367 CTASSERT(CAPRVER(right) == CAP_RIGHTS_VERSION); \ 368 cap_rights_t *_r = (r); \ 369 _r->cr_rights[CAPIDXBIT(right) - 1] |= right; \ 370 _r; \ 371 }) 372 373 /* 374 * Allow checking caps which are possibly getting modified at the same time. 375 * The caller is expected to determine whether the result is legitimate via 376 * other means, see fget_unlocked for an example. 377 */ 378 379 static inline bool 380 cap_rights_contains_transient(const cap_rights_t *big, const cap_rights_t *little) 381 { 382 383 if (__predict_true( 384 (big->cr_rights[0] & little->cr_rights[0]) == little->cr_rights[0] && 385 (big->cr_rights[1] & little->cr_rights[1]) == little->cr_rights[1])) 386 return (true); 387 return (false); 388 } 389 390 #define cap_rights_contains cap_rights_contains_transient 391 392 int cap_check_failed_notcapable(const cap_rights_t *havep, 393 const cap_rights_t *needp); 394 395 static inline int 396 cap_check_inline(const cap_rights_t *havep, const cap_rights_t *needp) 397 { 398 399 if (__predict_false(!cap_rights_contains(havep, needp))) 400 return (cap_check_failed_notcapable(havep, needp)); 401 return (0); 402 } 403 404 static inline int 405 cap_check_inline_transient(const cap_rights_t *havep, const cap_rights_t *needp) 406 { 407 408 if (__predict_false(!cap_rights_contains(havep, needp))) 409 return (1); 410 return (0); 411 } 412 #else 413 bool cap_rights_contains(const cap_rights_t *big, const cap_rights_t *little); 414 #endif 415 416 __END_DECLS 417 418 #ifdef _KERNEL 419 420 #include <sys/systm.h> 421 422 #define IN_CAPABILITY_MODE(td) (((td)->td_ucred->cr_flags & CRED_FLAG_CAPMODE) != 0) 423 424 struct filedesc; 425 struct filedescent; 426 427 /* 428 * Test whether a capability grants the requested rights. 429 */ 430 int cap_check(const cap_rights_t *havep, const cap_rights_t *needp); 431 /* 432 * Convert capability rights into VM access flags. 433 */ 434 vm_prot_t cap_rights_to_vmprot(const cap_rights_t *havep); 435 436 /* 437 * For the purposes of procstat(1) and similar tools, allow kern_descrip.c to 438 * extract the rights from a capability. 439 * 440 * Dereferencing fdep requires filedesc.h, but including it would cause 441 * significant pollution. Instead add a macro for consumers which want it, 442 * most notably kern_descrip.c. 443 */ 444 #define cap_rights_fde_inline(fdep) (&(fdep)->fde_rights) 445 446 const cap_rights_t *cap_rights_fde(const struct filedescent *fde); 447 const cap_rights_t *cap_rights(struct filedesc *fdp, int fd); 448 449 int cap_ioctl_check(struct filedesc *fdp, int fd, u_long cmd); 450 int cap_fcntl_check_fde(struct filedescent *fde, int cmd); 451 int cap_fcntl_check(struct filedesc *fdp, int fd, int cmd); 452 453 extern bool trap_enotcap; 454 455 #else /* !_KERNEL */ 456 457 __BEGIN_DECLS 458 /* 459 * cap_enter(): Cause the process to enter capability mode, which will 460 * prevent it from directly accessing global namespaces. System calls will 461 * be limited to process-local, process-inherited, or file descriptor 462 * operations. If already in capability mode, a no-op. 463 */ 464 int cap_enter(void); 465 466 /* 467 * Are we sandboxed (in capability mode)? 468 * This is a libc wrapper around the cap_getmode(2) system call. 469 */ 470 bool cap_sandboxed(void); 471 472 /* 473 * cap_getmode(): Are we in capability mode? 474 */ 475 int cap_getmode(u_int *modep); 476 477 /* 478 * Limits capability rights for the given descriptor (CAP_*). 479 */ 480 int cap_rights_limit(int fd, const cap_rights_t *rights); 481 /* 482 * Returns capability rights for the given descriptor. 483 */ 484 #define cap_rights_get(fd, rights) \ 485 __cap_rights_get(CAP_RIGHTS_VERSION, (fd), (rights)) 486 int __cap_rights_get(int version, int fd, cap_rights_t *rights); 487 /* 488 * Limits allowed ioctls for the given descriptor. 489 */ 490 int cap_ioctls_limit(int fd, const cap_ioctl_t *cmds, size_t ncmds); 491 /* 492 * Returns array of allowed ioctls for the given descriptor. 493 * If all ioctls are allowed, the cmds array is not populated and 494 * the function returns CAP_IOCTLS_ALL. 495 */ 496 ssize_t cap_ioctls_get(int fd, cap_ioctl_t *cmds, size_t maxcmds); 497 /* 498 * Limits allowed fcntls for the given descriptor (CAP_FCNTL_*). 499 */ 500 int cap_fcntls_limit(int fd, uint32_t fcntlrights); 501 /* 502 * Returns bitmask of allowed fcntls for the given descriptor. 503 */ 504 int cap_fcntls_get(int fd, uint32_t *fcntlrightsp); 505 506 __END_DECLS 507 508 #endif /* !_KERNEL */ 509 510 #endif /* !_SYS_CAPSICUM_H_ */ 511